US3631888A - Regulation of operating fluid flow to and from a user device - Google Patents

Regulation of operating fluid flow to and from a user device Download PDF

Info

Publication number
US3631888A
US3631888A US66490A US3631888DA US3631888A US 3631888 A US3631888 A US 3631888A US 66490 A US66490 A US 66490A US 3631888D A US3631888D A US 3631888DA US 3631888 A US3631888 A US 3631888A
Authority
US
United States
Prior art keywords
chamber
piston
control
valve
flow
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US66490A
Other languages
English (en)
Inventor
Eckhard Anton
Werner Schlechtriem
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE1943692A external-priority patent/DE1943692C3/de
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Application granted granted Critical
Publication of US3631888A publication Critical patent/US3631888A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/01—Locking-valves or other detent i.e. load-holding devices
    • F15B13/015—Locking-valves or other detent i.e. load-holding devices using an enclosed pilot flow valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00—Check valves
    • F16K15/18—Check valves with actuating mechanism; Combined check valves and actuated valves
    • F16K15/182—Check valves with actuating mechanism; Combined check valves and actuated valves with actuating mechanism
    • F16K15/1826—Check valves which can be actuated by a pilot valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K2200/00—Details of valves
    • F16K2200/30—Spring arrangements
    • F16K2200/304—Adjustable spring pre-loading
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7837—Direct response valves [i.e., check valve type]
    • Y10T137/7847—With leak passage
    • Y10T137/7848—Permits flow at valve interface
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7837—Direct response valves [i.e., check valve type]
    • Y10T137/7876—With external means for opposing bias
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/86928—Sequentially progressive opening or closing of plural valves
    • Y10T137/86936—Pressure equalizing or auxiliary shunt flow
    • Y10T137/86944—One valve seats against other valve [e.g., concentric valves]
    • Y10T137/86984—Actuator moves both valves

Definitions

  • a cylinder chamber is provided in a housing and a passage for flow of operating fluid to and from a user device.
  • a valve is arranged in this passage movable between a normal closed position and an open position in which it permits the flow of pressurized operating fluid to the user device through the passage.
  • a valve control piston is operatively associated with the valve and movable in the cylinder chamber from a rest position via a first and a subsequent second intermediate position to a control position in which latter it displaces the valve to open position so as to permit operating fluid to flow from the user device through the passage.
  • First and second control fluid inlets each communicate with the cylinder chamber for admitting respective streams of control fluid under pressure into the same.
  • the first inlet communicates with the chamber in all positions of the piston.
  • Control means on the piston serves to establish communication between the chamber and the second inlet when the piston moves from its first intermediate position to the second intermediate position, and for terminating this communication when the piston moves from the second intermediate position to the control position.
  • the present invention relates generally to the regulation of operating fluid during its flow to and from a user device. More particularly it relates to an apparatus for regulating this flow of operating fluid.
  • a valve of the one-way type normally permits the flow of an operating fluid from a fluid supply to a user device, but not a return flow away from the user device. Because such return flow is sometimes required, the copending application provides for a control arrangement permitting opening of the valve and return flow of operating fluid away from the user device when this is desired. This opening is effected by movement of a control piston which displaces an actuating member, with the latter in turn acting upon the valve in a sense moving it to open position.
  • the related application in question attempts to provide a construction wherein the undesirably rapid movement of the control piston from its rest position to its control position in which it effects opening of the valvewhich rapid movement is common to all other prior art constructions of this type-by assuring that the control piston moves initially only slowly from rest position to operating position and is braked as it approaches the operating position.
  • one feature of the invention recites in an apparatus of the type in question, namely an apparatus for regulating the flow of an operating fluid to and from a user device
  • a user device which, according to one embodiment comprises, briefly stated, housing means having a cylinder member and a passage for flow' of the operating fluid to and from the user device.
  • Valve means is provided in this passage and is movable between a normal closed position and an open position in which it permits the flow of pressurized operating fluid these inlet means the first inlet means communicates with the chamber in all positions of the piston means.
  • control means on the piston means is operative for establishing communication between the chamber and the second inlet means upon movement of the piston means from its first intermediate position to the second intermediate position, and for terminating such communication upon movement of the piston means from the second intermediate position to the control position.
  • FIGURE is an axial section through an apparatus according to the present invention illustrating one embodiment.
  • the housing portion 1 is provided with a passage 11 having an inlet 12a for operating fluid and derived from an operating fluid supply which is diagrammatically illustrated, and an outlet 12b communicating with a diagrammatically illustrated user device to which the operating fluid is to be supplied.
  • the passage 11 has an annular passage portion 11a.
  • the housing portion 16, and 10 is provided with a cylinder chamber 15 which is separated from the passage 11 by a wall portion la of the housing portion 1, with the wall portion 10 being provided with a bore or aperture 13.
  • a sleeve 2 is mounted in the passage 11 so as to be surrounded by the annular passage portion lla. It accommodates a cup-shaped valve body 3 of a main valve and is held in place by a cover or closure member 10 which is suitably secured to and constitutes a part of the housing portion 1.
  • a shoulder 4 is provided in the sleeve 2 and configurated as the valve seat for the main valve body 3 which latter is provided in its bottom wall with a center bore 5 axially aligned with the bore or aperture l3 and penetrated by a pin 6 provided on a second smaller valve body 7 of a control valve.
  • the valve body 7 abuts against a valve seat which is constituted by the edge of the bore 5.
  • a shoulder 8 on the valve body 7 is engaged by one end of a compression spring ,or expansion spring 9 theiother end of which abuts against the cover 10, with the spring 9 constituting the closure spring or biassing means for both of the valve bodies 3 and 7.
  • the bore or aperture 13 in the wall portion 1a is coaxial with the bore 5, and through the aperture 13 there extends slidably but sealtightly (the sealing means are illustrated but not separately identified because they are known) a pin or actuating portion 14. One end portion thereof is located in ,the passage 11 and the other end portion is located in the cylinder chamber 15.
  • a control piston 17 Accommodated for slidable movement in the cylinder chamber 15 is a control piston 17.
  • the housing portion 16 is in addition provided with a transverse bore 18 in which there is accommodated a member 19 having an enlarged cross-sectional portion 21 provided with longitudinal grooves or kerfs 20. This enlarged portion 21 is followed in the member 19 by a cylindrical portion 22 of lesser diameter which is located in a portion 23 of larger diameter of the bore 18.
  • the portion 22 of the member 19 is hollow and, as illustrated, accommodates in its interior a spring 24 which abuts against a screw or similar element 26 which is threaded into'one end of the transverse bore 18 so that the spring 24 urges the member 19 against an adjusting screw which is threaded into the other open end of the bore 18 and which is identified with reference numeral 25.
  • the juncture between the enlarged portion 23 and a portion 27 of the bore 18 constitutes, in cooperation with the kerfs 20 in the portion 21 of the member 19, a throttling gap for fluid.
  • Such fluid can be supplied from a diagrammatically illustrated control fluid supply via a normally closed valve 29a of any suitable construction to a channel 29 of the housing portion 1 which in turn communicates with a channel 28 provided in the housing portion 16.
  • the channel 28 communicatesat its free end with that portion of the bore 18 in which the upper end of the spring 24 is located.
  • the passage 28 traverses and communicates with an annular groove or p ce 30 provided in an inner peripheral surface bounding the cylinder chamber and being identified with reference numeral 31.
  • the piston 17 is provided with one or more radial bores 32 extending inwardly from an annular groove 39 provided in its outer circumferential face; the inner ends of the bores 32 communicate with one or more substantially axial bores 38 which terminate at the left-hand end face 36 of the piston 17.
  • the circumferential groove 39 is bounded by two axially spaced sidewalls, of which the one which is closer to the end face 36 is identified with reference numeral 40 whereas the other one is identified with reference numeral 43.
  • a portion 41 of the sidewall 40 is inclined radially outwardly as well as in axial direction of the piston 17 towards the end face 36 thereof.
  • the portion 43 is bounded by an annular margin, 42 whereas the sidewall 43 is bounded at its juncture with the circumferential face of the piston 17 by an annular margin 44.
  • a bore or aperture 33 connects the interior of the cylinder chamber 15 to the left of the end face 36 of the piston 17, with the portion 27 of the transverse bore 18.
  • a throttling leakage fluid bore 45 communicates with a pressureless space so that leakage fluid can escape from the chamber 15.
  • valves 3 and 7 are opened to thereby establish communication between the pressurized control fluid supply and the passage 29. From there the fluid passes the channel 28 and enters into the bore 18 where the flow of fluid is throttled by virtue of the fact that the throttling gap, that is the small cross section of the valves permits no faster flow.
  • the piston 17 To reach this right-hand control position from the illustrated rest position, the piston 17 must proceed via two intermediate positions. In the first intermediate position, to which it moves slowly as pointed out before under the influence of the pressure fluid admitted into the cylinder chamber 15 through the bore 33 the margin 44 of the groove 39 in the piston 17 moves past the left-hand edge bounding the channel 30 so that the interior of the latter can now communicate with the groove 39. A substantial quantity of pressurized control fluid can now enter from the channel 28 through the channel 30 into the groove 39 and flow from there via the bores 32 and 38 towards the left-hand end face 36 of the piston 17, thereby imparting to the latter a substantially increased pressure and causing the piston 17 to move more rapidly towards the right.
  • valves 3 and 7 are to return to their nonnal closed position in which they permit only one-way flow of operating fluid from the inlet 12a to the outlet 12b of the passage 11, it is merely necessary to close the valve 29a whereupon-in the absence of any further pressure acting upon the piston 17- the spring 9 displaces the valve members 3 and 7 towards the left to closure position, thereby pushing the member 14 towards the left and in turn displacing via the member 14 the piston 17 past the second and first intermediate positions thereof back to the illustrated rest position.
  • Fluid contained in the cylinder chamber 15 at the left-hand side of the piston 17 is expelled during such movement of the piston 17, and a nonillustrated escape passage for the fluid-for instance leading to a pressureless space, such as a reservoir or the like-is provided for this purpose.
  • An apparatus for regulating the flow of an operatingfluid to and from a user device comprising housing means having a cylinder chamber, and a passage for flow of said operating fluid to and from said user device; valve means in said passage and movable between a normal-closed position and an open position permitting the flow of pressurized operating fluid to said user device; valve control piston means operatively associated with said valve means and movable in said cylinder chamber from a rest position via a first and a subsequent second intermediate position to a control position in which it displaces said valve means to open position for permitting a flow of operating fluid from said user device through said passage; first and second control fluid inlet means each communicating with said chamber for admitting into the latter respective quantities of control fluid under pressure, said first inlet means communicating with said chamber in all of said positions of said piston means; and control means on said piston means operative for establishing communication between said chamber and said second inlet means upon movement of said piston means from said first intermediate position to said second intermediate position, and for terminating such communication upon movement of said piston means from
  • said chamber having a first and a remote second end, and said piston means being located at said first end when in said rest position and at said second end when in said control position; and wherein said first control fluid inlet means communicates with said chamber in the region of said first end.
  • said piston means having a circumferential face and an end face facing towards said first end of said chamber, and at least one channel extending from said circumferential face to said end face; and wherein said chamber is bounded by an inner peripheral surface and said second inlet means is provided in said inner peripheral surface intermediate said first and second ends of said chamber and arranged to communicate with said chamber via said channel of said piston means upon movement of the latter from said first intermediate position to said second intermediate position.
  • said channel comprising an annular radially outwardly open first channel portion and surrounding the longitudinal axis of the latter, and a second channel portion communicating with said first channel portion and having an open end at said end face of said piston means.
  • annular first channel portion having a first annular margin axially farther spaced from, and a second annular margin axially closer to said end face of said piston means, said annular margins constituting said control means with communication between said second inlet means and said first channel portion being established in response to movement of said first annular margin past said second inlet means in direction toward said second end of said chamber, and being terminated in response to subsequent movement of said second annular margin past said second inlet means in said direction.
  • said first annular channel portion including respective axially spaced sidewalls each provided with one of said margins; and wherein at least one of said sidewalls is at least in part inclined in axial direction of said piston means.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Check Valves (AREA)
  • Fluid-Driven Valves (AREA)
  • Fluid-Pressure Circuits (AREA)
US66490A 1969-08-28 1970-08-24 Regulation of operating fluid flow to and from a user device Expired - Lifetime US3631888A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1943692A DE1943692C3 (de) 1968-12-12 1969-08-28 Federbelastetes Rückschlagventil

Publications (1)

Publication Number Publication Date
US3631888A true US3631888A (en) 1972-01-04

Family

ID=5743980

Family Applications (1)

Application Number Title Priority Date Filing Date
US66490A Expired - Lifetime US3631888A (en) 1969-08-28 1970-08-24 Regulation of operating fluid flow to and from a user device

Country Status (5)

Country Link
US (1) US3631888A (enrdf_load_stackoverflow)
JP (1) JPS4946805B1 (enrdf_load_stackoverflow)
AT (1) AT306466B (enrdf_load_stackoverflow)
FR (1) FR2058412B2 (enrdf_load_stackoverflow)
GB (1) GB1293039A (enrdf_load_stackoverflow)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4168865A (en) * 1977-11-14 1979-09-25 General Signal Corporation Hydraulic handbrake control system
US4562862A (en) * 1982-12-22 1986-01-07 Mannesmann Rexroth Gmbh Hydraulically unblockable non-return valve
US4615354A (en) * 1980-05-08 1986-10-07 S.I.G.M.A. - Societa Idraulica Generale Macchine Accessori Valve system timing device for pipes carrying liquid under pressure
US4687177A (en) * 1985-06-10 1987-08-18 Mannesmann Rexroth Gmbh Device for adjusting the switching time of a valve member
US5255705A (en) * 1986-01-30 1993-10-26 Kabushiki Kaisha Komatsu Seisakusho Hydraulic pressure control system
WO1994020778A1 (en) * 1993-03-02 1994-09-15 Sandvik Ab One-way valve for automatic or manual actuation in holders for chain-saw guidebars
US5494078A (en) * 1995-01-09 1996-02-27 The Aro Corporation Pneumatic lift device for dual flow valve
US6079497A (en) * 1997-06-03 2000-06-27 Camco International Inc. Pressure equalizing safety valve for subterranean wells
US6283217B1 (en) 1998-08-06 2001-09-04 Schlumberger Technology Corp. Axial equalizing valve
US6296061B1 (en) 1998-12-22 2001-10-02 Camco International Inc. Pilot-operated pressure-equalizing mechanism for subsurface valve
US6712242B2 (en) 2000-10-26 2004-03-30 International Dispensing Corporation Fluid dispensing system and dual-mode, system fluid actuated valve for use therein
US20040094207A1 (en) * 2000-08-31 2004-05-20 Helmut Behl Unlockable non-return valve for very high system pressures
US20060011234A1 (en) * 2004-07-15 2006-01-19 Eaton Corporation Fuel vapor vent valve float assembly and method of making same
US20070157971A1 (en) * 2004-07-12 2007-07-12 Tiefenbach Control Systems Gmbh Releasable non-return valve
US20120060941A1 (en) * 2009-05-19 2012-03-15 Roman Timothy S Pneumatically detented pilot valve
US20220170343A1 (en) * 2019-07-03 2022-06-02 Petroleum Technology Company As Valve arrangement
US20220186851A1 (en) * 2019-03-27 2022-06-16 Lontra Limited Check valve
US11781663B2 (en) * 2021-10-21 2023-10-10 Smc Corporation Pilot check valve

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5683051U (enrdf_load_stackoverflow) * 1979-11-28 1981-07-04
JPS6062961U (ja) * 1983-10-07 1985-05-02 スチールケースくろがね株式会社 プリンタ台
DE102005025917A1 (de) * 2005-06-06 2006-12-07 Marco Systemanalyse Und Entwicklung Gmbh Ventilpatrone und Ventilanordnung
CN103899596B (zh) * 2014-03-31 2016-11-02 雷永志 一种带先导单向阀的液压锁

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US885459A (en) * 1907-05-22 1908-04-21 William B Engler Valve for gas-engines.
US1591671A (en) * 1923-01-26 1926-07-06 Westinghouse Electric & Mfg Co Valve-operating mechanism
US2382457A (en) * 1943-11-30 1945-08-14 Wertman David Cradle operating cylinder

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US885459A (en) * 1907-05-22 1908-04-21 William B Engler Valve for gas-engines.
US1591671A (en) * 1923-01-26 1926-07-06 Westinghouse Electric & Mfg Co Valve-operating mechanism
US2382457A (en) * 1943-11-30 1945-08-14 Wertman David Cradle operating cylinder

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4168865A (en) * 1977-11-14 1979-09-25 General Signal Corporation Hydraulic handbrake control system
US4615354A (en) * 1980-05-08 1986-10-07 S.I.G.M.A. - Societa Idraulica Generale Macchine Accessori Valve system timing device for pipes carrying liquid under pressure
US4562862A (en) * 1982-12-22 1986-01-07 Mannesmann Rexroth Gmbh Hydraulically unblockable non-return valve
US4687177A (en) * 1985-06-10 1987-08-18 Mannesmann Rexroth Gmbh Device for adjusting the switching time of a valve member
US5255705A (en) * 1986-01-30 1993-10-26 Kabushiki Kaisha Komatsu Seisakusho Hydraulic pressure control system
WO1994020778A1 (en) * 1993-03-02 1994-09-15 Sandvik Ab One-way valve for automatic or manual actuation in holders for chain-saw guidebars
US5494078A (en) * 1995-01-09 1996-02-27 The Aro Corporation Pneumatic lift device for dual flow valve
US6079497A (en) * 1997-06-03 2000-06-27 Camco International Inc. Pressure equalizing safety valve for subterranean wells
US6283217B1 (en) 1998-08-06 2001-09-04 Schlumberger Technology Corp. Axial equalizing valve
US6296061B1 (en) 1998-12-22 2001-10-02 Camco International Inc. Pilot-operated pressure-equalizing mechanism for subsurface valve
US6820645B2 (en) * 2000-08-31 2004-11-23 Bosch Rexroth Ag Unlockable non-return valve for very high system pressures
US20040094207A1 (en) * 2000-08-31 2004-05-20 Helmut Behl Unlockable non-return valve for very high system pressures
US6712242B2 (en) 2000-10-26 2004-03-30 International Dispensing Corporation Fluid dispensing system and dual-mode, system fluid actuated valve for use therein
US20070157971A1 (en) * 2004-07-12 2007-07-12 Tiefenbach Control Systems Gmbh Releasable non-return valve
US7357152B2 (en) * 2004-07-12 2008-04-15 Tiefenbach Control Systems Gmbh Releasable non-return valve
US20060011234A1 (en) * 2004-07-15 2006-01-19 Eaton Corporation Fuel vapor vent valve float assembly and method of making same
RU2505730C2 (ru) * 2009-05-19 2014-01-27 Грако Миннесота Инк. Управляющий пневмоклапан
US20120060941A1 (en) * 2009-05-19 2012-03-15 Roman Timothy S Pneumatically detented pilot valve
US8857467B2 (en) * 2009-05-19 2014-10-14 Graco Minnesota Inc. Pneumatically detented pilot valve
US20220186851A1 (en) * 2019-03-27 2022-06-16 Lontra Limited Check valve
US11859724B2 (en) * 2019-03-27 2024-01-02 Lontra Limited Check valve
US20220170343A1 (en) * 2019-07-03 2022-06-02 Petroleum Technology Company As Valve arrangement
US12264554B2 (en) * 2019-07-03 2025-04-01 Petroleum Technology Company As Valve arrangement
US11781663B2 (en) * 2021-10-21 2023-10-10 Smc Corporation Pilot check valve

Also Published As

Publication number Publication date
FR2058412B2 (enrdf_load_stackoverflow) 1973-05-25
GB1293039A (en) 1972-10-18
AT306466B (de) 1973-04-10
JPS4946805B1 (enrdf_load_stackoverflow) 1974-12-12
FR2058412A2 (enrdf_load_stackoverflow) 1971-05-28

Similar Documents

Publication Publication Date Title
US3631888A (en) Regulation of operating fluid flow to and from a user device
US3631887A (en) Fluid-flow-regulating apparatus
US3667722A (en) Proportional valve
US6390441B2 (en) Solenoid operated pilot valve
US4119294A (en) Pressure-regulating valve
US3427928A (en) Compressed air-operated drive-in apparatus to drive-in fasteners
US3213760A (en) Fluid cushion
US3805837A (en) Fluid-controlling valve
US4080687A (en) Door closer
US2980132A (en) Safety relief valve
US2700397A (en) Unloading valve
US4562862A (en) Hydraulically unblockable non-return valve
US4527592A (en) Flow control valve for hydraulic circuits
US3874406A (en) Control valve assembly
US4130127A (en) Accumulator changing valve
US2786452A (en) Fluid actuated cylinder having fluid cushion means
US4963692A (en) Brake control valve
US3375844A (en) Unloader valve
US3790146A (en) Fluid filled supporting leg
KR890003574B1 (ko) 유압 서보 기구의 손실 행정 감소 장치
US3550611A (en) Unitary combination of pressure-responsive flow control unidirectional valves for hydraulic systems
JPS6170201A (ja) 液圧自己保持式２位置切換弁
US4027482A (en) Variable ratio hydraulic master-cylinder
US3294104A (en) Pressure control unit for hydraulic systems
US3771553A (en) Pilot-operated shut-off valve